Conceding six goals over the course of the games will disappoint fans more, showing weakness in Notts' supposedley strongest area.
"Our defensive play in the last two games has disappointed me," he said.
Goals from Gary Silk, Hector Sam and Richard Butcher have sadly brought no points to a County side with just wins to their name all season.
"One thing I will say is that we have shown once again we have great fighting spirit," added Thompson.
"To get back to 1-1 (at Wycombe) we were delighted and I felt we could have held it for a while and gone on and won it.
"We kept going to the end which pleased me and the fitness was good, but clearly we need to work on the defensive play," said the Notts boss.
On the other side of the coin, Wycombe chief Paul Lambert was delighted with his sides victory over the ten-man County.
He singled out all three goalscorers for praise in the aftermath of the game at Adams Park.
"Scott McGliesh was excellent...John Sutton showed his composure...I was delighted for Matty Bloomfield," he said.
All quotaions taken from Official Site and BBC Sport